QML version of the Desktop Grid effect

Replace completely the old desktop grid effect with a QML version.
Aims to feature parity and be a change as transparent as possible for the user.

BUG: 433071
BUG: 452625
BUG: 443971
BUG: 437121
BUG: 452925
BUG: 437928
BUG: 452439
BUG: 288530
BUG: 450254
BUG: 450106
BUG: 447832
BUG: 449960
BUG: 416576
BUG: 441862
BUG: 444859
BUG: 445999
BUG: 422117
BUG: 404627
BUG: 435483
BUG: 420744
BUG: 435482
BUG: 427055
BUG: 333445
BUG: 429120
BUG: 427391
BUG: 409295
BUG: 294322
BUG: 356955
FIXED-IN: 5.25